The use of functional gradient structure is Drilling String Crossover Sub decomposed at high temperature Ti (CN) compounds, atomic diffusion and heat transfer generated gradient in the material. Such as: sintering and heat treatment process through the appropriate atmosphere to induce proliferation-related elements in the air to change the microstructure analysis of cemented carbide, and the material properties of the gradient appears in one-, two-, three-dimensional space (mainly from the Co content table and in the change), can solve the contradiction between the existence of internal performance carbide, this technology has been in the Swedish company Sandvik industrial applications in foreign countries, and our late start, although after 10 years of research work, but still at the laboratory stage, from industrial applications must strive, breakthrough key technologies and equipment have yet to be.
Increase the surface coating to improve the mechanical properties of materials. Experiment was done, with TiN coated drills, life can be increased by 50% to 60%. Chapter Jiangxi Tungsten Industry Company Sheep build high total workers, who made a lot of work, after the coating material has greatly improved in hardness and wear resistance, coating methods casing and tubing coupling continue to progress, from a chemical vapor deposition development of plasma physical vapor deposition, laser surface strengthening treatment methods. Also heat treatment, cryogenic treatment, magnetic treatment technology can improve the performance of the material.